The 8th DLC landed on Sadachiba, supported by Redfield's Renegades. Though expecting a 'Mech regiment, no DCMS forces were found on world. The ISF agents assigned to the world began playing on the fears of the troopers, stirring up paranoia.[3] After several months of terrorist tactics, the 8th's morale was very low. The 9th Dieron Regulars used this opportunity to arrive on Sadachiba. Though the DLC destroyed one of the 9th Dieron Regulars battalions completely, the remaining Regulars smashed into the 8th DLC as the Cavalry tried to withdraw. What should have been an orderly retreat became a grinding withdrawal under constant fire and harassment attacks.[4]

In the late 3060's the homeworld of the 8th Deneb Light Cavalry was Kikuyu. There they garrisoned two main bases and tried to get their LAAF commanders to deliver parts and supplies. During the FedCom Civil War, the 6th Donegal Guards and Storm's Metal Thunder invaded the world.[5] The Sixth Donegal Guards overran the northern DLC base in a few hours, allowing only a few companies to escape. The rest of the Deneb Light Cavalry members (approximately half the RCT) were captured or killed.[6] Storm's Metal Thunder, supported by two armored regiments, attacked the southern DLC base. The grounded several kilometers from the base, which provided the remaining half of the DLC to organize a defense. They used their superior speed to keep the Metal Thunder off-balance and on the defensive. Eventually the Metal Thunder withdrew from their attack. The 8th DLC fought on for another two weeks but when the 6th Donegal reinforced Storm's Metal Thunder they knew it was time to leave. The Eighth fired several artillery shells filled with a non-lethal gas compound into the Lyran lines. These shells caused a great deal of confusion among the Guard and Metal Thunder units, allowing the DLC to board its DropShips and escape.[7]

After arriving on Blue Hole the Eighth sparred with the 3rd Alliance Guards for a few weeks. The arrival of Storm's Metal Thunder changed the balance of power on the world, and the DLC led the Lyran units on a months-long chase across the world. When Clan Jade Falcon forces attacked Blue Hole the DLC tried to help their former countrymen, but the Lyrans fired on them. The DLC continued their practice of remaining mobile which prevented the Falcons from destroying them. The Lyran units, by contract, were nearly destroyed by the Falcons and withdrew from the world. The DLC faced the Falcon's 7th Talon and was nearly destroyed. Only the timely arrival of Clan Wolf-in-Exile's 1st Wolf Legion saved them from destruction.[8]

During their trip back to the Federated Suns, the 8th would begin the rebuilding process by absorbing survivors from other destroyed units.[9]

The Word of Blake learned that the 8th Deneb Light Cavalry was planning a raid on Addicks. The Blakists struck the 8th DLC's transports as they were preparing to leave New Rhodes III, destroying nearly every member of the 8th DLC. Only two battalions (one 'Mech, one battle armor) were able to escape.[10] The 8th Deneb Light Cavalry got their revenge however by assaulting the Sydney Australia Castle Brian in the assault on Terra.[11]

Upon learning that the 4th Deneb Light Cavalry was still alive, the Eighth immediately moved to Deneb Kaitos to support their sister unit. After rebuilding from their early losses, the Eighth transferred several soldiers over to the rebuilding command. This allowed the Fourth to remain in place on Deneb Kaitos, but also allowed the Fourth to take a position that placed them at odds with the AFFS High Command. Until the Marlette Crucis March Militia is reconstituted, the Eighth is garrisoning Marlette[12]

After the Jihad ended, the AFFS "gifted" the newly formed Republic of the Sphere with the Eighth Deneb Light Cavalry.[13] The unit was heavily damaged, and so the Republic Armed Forces used the Eighth DLC to form the planetary guard of Deneb Kaitos and some other nearby worlds.[14]

After rebuilding from their early losses, the Eighth DLC was at nearly seventy percent of their pre-Jihad strength. Their participation on Terra reduced their numbers considerably, and the need to re-build the Fourth DLC also took a serious toll. The Eighth is down to one third of their pre-Jihad strength.[12]